TOA RADIO MICROPHONE model WM-3210
Preliminary Information
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CONTENTS
1. GENERAL DESCRIPTION ............................................................................ 2
2. FEATURES ......................................................................................................... 2
3. SPECIFICATIONS ............................................................................................ 2
4. TEST CONDITIONS ......................................................................................... 2
5. APPEARANCE .................................................................................................. 5
6. BLOCK DIAGRAM ........................................................................................... 6
7. CIRCUIT EXPLANATION ............................................................................... 7
8. OPERATING INSTRUCTIONS .................................................................... 9
2
1. GENERAL DESCRIPTION
The TOA wireless microphone WM-3210 is of hand-held type and is designed to conform with the regulations.
It employs an optimized PLL-synthesizer and a compander noise reduction circuit to minimize the influence of
ambient RF noise.
2. FEATURES
(1) Up to 6 operating frequencies are made available for selection.
(2) An optimized PLL-synthesizer minimizes the oscillation frequency drift resulting from the ambient
temperature or voltage fluctuation.
(3) Battery lamp indicates battery consumption to prevent the unit from malfunctioning when the battery level
remarkably decreases.
(4) The compressor and low-pass filter on the audio circuit protect the unit against out-of-band energy
produced by overload.
(5) Chip components make the unit smaller in size yet more reliable.
(6) 6 frequencies of 169 - 216 MHz
3. SPECIFICATIONS
Model No. WM-3210
Oscillator Crystal-contorolled PLL-synthesizer
Nominal Frequency 6 frequencies of 169 - 216 MHz
RF Power Output Less than 50mW
Modulation Frequency Modulation
Nominal Supply Voltage 9.0V
Usable Battery 6LR61(9.0V Alkaline)
Marginal Battery Voltage Level Approx. 6 V (When the battery voltage falls below this level, the battery
lamp begins to flash.)
Antenna
4. TEST CONDITIONS
(1) Modulation and Non-modulation
[Modulation]
First remove the windscreen and then the microphone capsule having a 3-pin connector. Connect the same 3-
pin connector from the jig (shown below) attached to the microphone sample to the resultant connector inside
the microphone. Then, connect the jig output to an AF oscillator using the shielded or coaxial cable. For
connection, refer to the figure below.
NOTE. Pin #1: Ground, Pin #2: Ground, Pin #3: Input (HOT)
2
1. GENERAL DESCRIPTION
The TOA wireless microphone WM-3210 is of hand-held type and is designed to conform with the regulations.
It employs an optimized PLL-synthesizer and a compander noise reduction circuit to minimize the influence of
ambient RF noise.
2. FEATURES
(1) Up to 6 operating frequencies are made available for selection.
(2) An optimized PLL-synthesizer minimizes the oscillation frequency drift resulting from the ambient
temperature or voltage fluctuation.
(3) Battery lamp indicates battery consumption to prevent the unit from malfunctioning when the battery level
remarkably decreases.
(4) The compressor and low-pass filter on the audio circuit protect the unit against out-of-band energy
produced by overload.
(5) Chip components make the unit smaller in size yet more reliable.
(6) 6 frequencies of 169 - 216 MHz
3. SPECIFICATIONS
Model No. WM-3210
Oscillator Crystal-contorolled PLL-synthesizer
Nominal Frequency 6 frequencies of 169 - 216 MHz
RF Power Output Less than 50mW
Modulation Frequency Modulation
Nominal Supply Voltage 9.0V
Usable Battery 6LR61(9.0V Alkaline)
Marginal Battery Voltage Level Approx. 6 V (When the battery voltage falls below this level, the battery
lamp begins to flash.)
Antenna
4. TEST CONDITIONS
(1) Modulation and Non-modulation
[Modulation]
First remove the windscreen and then the microphone capsule having a 3-pin connector. Connect the same 3-
pin connector from the jig (shown below) attached to the microphone sample to the resultant connector inside
the microphone. Then, connect the jig output to an AF oscillator using the shielded or coaxial cable. For
connection, refer to the figure below.
NOTE. Pin #1: Ground, Pin #2: Ground, Pin #3: Input (HOT)
2
1. GENERAL DESCRIPTION
The TOA wireless microphone WM-3210 is of hand-held type and is designed to conform with the regulations.
It employs an optimized PLL-synthesizer and a compander noise reduction circuit to minimize the influence of
ambient RF noise.
2. FEATURES
(1) Up to 6 operating frequencies are made available for selection.
(2) An optimized PLL-synthesizer minimizes the oscillation frequency drift resulting from the ambient
temperature or voltage fluctuation.
(3) Battery lamp indicates battery consumption to prevent the unit from malfunctioning when the battery level
remarkably decreases.
(4) The compressor and low-pass filter on the audio circuit protect the unit against out-of-band energy
produced by overload.
(5) Chip components make the unit smaller in size yet more reliable.
(6) 6 frequencies of 169 - 216 MHz
3. SPECIFICATIONS
Model No. WM-3210
Oscillator Crystal-contorolled PLL-synthesizer
Nominal Frequency 6 frequencies of 169 - 216 MHz
RF Power Output Less than 50mW
Modulation Frequency Modulation
Nominal Supply Voltage 9.0V
Usable Battery 6LR61(9.0V Alkaline)
Marginal Battery Voltage Level Approx. 6 V (When the battery voltage falls below this level, the battery
lamp begins to flash.)
Antenna
4. TEST CONDITIONS
(1) Modulation and Non-modulation
[Modulation]
First remove the windscreen and then the microphone capsule having a 3-pin connector. Connect the same 3-
pin connector from the jig (shown below) attached to the microphone sample to the resultant connector inside
the microphone. Then, connect the jig output to an AF oscillator using the shielded or coaxial cable. For
connection, refer to the figure below.
NOTE. Pin #1: Ground, Pin #2: Ground, Pin #3: Input (HOT)
2
1. GENERAL DESCRIPTION
The TOA wireless microphone WM-3210 is of hand-held type and is designed to conform with the regulations.
It employs an optimized PLL-synthesizer and a compander noise reduction circuit to minimize the influence of
ambient RF noise.
2. FEATURES
(1) Up to 6 operating frequencies are made available for selection.
(2) An optimized PLL-synthesizer minimizes the oscillation frequency drift resulting from the ambient
temperature or voltage fluctuation.
(3) Battery lamp indicates battery consumption to prevent the unit from malfunctioning when the battery level
remarkably decreases.
(4) The compressor and low-pass filter on the audio circuit protect the unit against out-of-band energy
produced by overload.
(5) Chip components make the unit smaller in size yet more reliable.
(6) 6 frequencies of 169 - 216 MHz
3. SPECIFICATIONS
Model No. WM-3210
Oscillator Crystal-contorolled PLL-synthesizer
Nominal Frequency 6 frequencies of 169 - 216 MHz
RF Power Output Less than 50mW
Modulation Frequency Modulation
Nominal Supply Voltage 9.0V
Usable Battery 6LR61(9.0V Alkaline)
Marginal Battery Voltage Level Approx. 6 V (When the battery voltage falls below this level, the battery
lamp begins to flash.)
Antenna
Internal Antenna
4. TEST CONDITIONS
(1) Modulation and Non-modulation
[Modulation]
First remove the windscreen and then the microphone capsule having a 3-pin connector. Connect the same 3-
pin connector from the jig (shown below) attached to the microphone sample to the resultant connector inside
the microphone. Then, connect the jig output to an AF oscillator using the shielded or coaxial cable. For
connection, refer to the figure below.
NOTE. Pin #1: Ground, Pin #2: Ground, Pin #3: Input (HOT)
25 V 33MF for Phantom block
To WM-4210
HOT
GND
To AF SG
or
600 ohm R
<Fig. 1. Jig>
25 V 33MF for Phantom block
To WM-4210
HOT
GND
To AF SG
or
600 ohm R
<Fig. 1. Jig>
25 V 33MF for Phantom block
To WM-4210
HOT
GND
To AF SG
or
600 ohm R
<Fig. 1. Jig>
25 V 33MF for Phantom block
To WM-4210
HOT
GND
To AF SG
or
600 ohm R
<Fig. 1. Jig>
25 V 33MF for Phantom block
To WM-4210
HOT
GND
To AF SG
or
600 ohm R
<Fig. 1. Jig>
25 V 33MF for Phantom block
To WM-4210
HOT
GND
To AF SG
or
600 ohm R
<Fig. 1. Jig>
25 V 33MF for Phantom block
To WM-4210
HOT
GND
To AF SG
or
600 ohm R
<Fig. 1. Jig>
25 V 33MF for Phantom block
To WM-3210
HOT
GND
To AF SG
or
600 ohm R
<Fig. 1. Jig>
After connection completion, feed an audio frequency signal continuously through both the HOT and
grounding terminals. This permits modulation to be performed.
3
[Non-modulation]
Disconnect the AF oscillator from the jig, then connect a 600 Ωresistor (the same impedance as that of the
microphone) to both the HOT and grounding terminals.
(2) Connections for RF Measurement
To measure an RF signal, use the coaxial cable attached to the microphone sample submitted. Connect the 3-
pin connector from the coaxial cable to CN9 on the circuit board inside the microphone. (Remove the antenna
wire.) Connect the coaxial cable's BNC end to measuring equipment.
To CN9 To RF Mesuring equipment
<Fig. 2. Coaxial Cable>
(3) Power Supply Connection
The wireless microphone is operated by the battery placed in the battery compartment. To use the external
power supply instead of the battery, connect the battery terminals inside the battery compartment to the
external power supply.
(4)Tone Squelch Circuit
To prevent noise of a disturbing radio signal from being provided when the microphone receives the disturbing
signal, the tone signal is superimposed on the audio signal, and the superimposed signals are modulated.
The receiver always checks the tone signal transmitted from the microphone so that the audio output is not
provided from the receiver when it receives an undesired radio signal. The tone signal transmitted from the
microphone is set for 32.768 kHz with deviation of 1.7 kHz.
When the carrier is modulated only by the tone signal, the first side band is the level of 31.7 dB (0.0068%)
below the carrier power, and the second side band 70 dB below the carrier power. This means that the tone
squelch system does not affect the out-of-band power.
(Reference)
FM modulation element of tone signal
Expansion with the Bessel function of instantaneous current i of FM modulated radio wave
i=Io[Jo(mf)sin(Wot)+J1(mf){sin(Wo+Wm)t-sin(Wo-Wm)t}+J2(mf){sin(Wo+Wm)t-sin(Wo-
Wm)t}+J3(mf){sin(Wo+Wm)t-sin(Wo-Wm)t}+.....]
Io: Maximum current value
mf: modulation index
Wo: Angular frequency of carrier wave
Wm: Angular frequency of modulation wave
approxmate formula of Bessel function when mf <<1
Jo(mf)=1 J1(mf)=mf/2 J2(mf)=mf2/8 J3(mf)=mf3/48
4
(6) Assembly and Disassembly of the Unit
<Disassembling the unit>
1. Holding the Mic Body, turn the Battery Case (microphone grip) counter-clockwise to remove it.
2. Take out the battery.
3. Using the Phillips screwdriver, remove the screw holding the Antenna Cover to remove the Cover.
4. Using the soldering iron, take off the soldered joint of the antenna cable on the printed circuit board.
5. Remove the windscreen by turning it counter-clockwise.
6. Using the Phillips screwdriver, remove the screw holding the Name Ring, then remove the Name Ring and
the microphone's internal lock holder.
7. Remove the Switch Holder.
8. Take the printed circuit board out of the microphone body.
<Assembling the unit>
To re-assemble the disassembled microphone, reverse the procedures above.
(6) Wind Screen Name Ring
P.C.B.
Rock Holder
(5)
(7) Switch Knob and Holder
Antenna Cover
(4) (1)
(2)
(3)
Battery Case
Battery
BODYMIC
5
5. APPEARANCE
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